KR100558653B1 - refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore - Google Patents

refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore Download PDF

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KR100558653B1
KR100558653B1 KR20030059132A KR20030059132A KR100558653B1 KR 100558653 B1 KR100558653 B1 KR 100558653B1 KR 20030059132 A KR20030059132 A KR 20030059132A KR 20030059132 A KR20030059132 A KR 20030059132A KR 100558653 B1 KR100558653 B1 KR 100558653B1
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reduction furnace
iron ore
ceiling
weight
bed reduction
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KR20030059132A
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KR20050022109A (en
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최도문
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조선내화 주식회사
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Priority to CN2009102536544A priority patent/CN101759437B/en
Priority to PCT/KR2004/002098 priority patent/WO2005019482A1/en
Priority to CNA2004800240584A priority patent/CN1839208A/en
Publication of KR20050022109A publication Critical patent/KR20050022109A/en
Priority to ZA200601585A priority patent/ZA200601585B/en
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    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62665—Flame, plasma or melting treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
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Abstract

본 발명은 분철광석의 환원을 위한 유동층 환원로의 천정부 성형에 이용되는 내화 조성물에 관한 것으로, 환원가스 분위기에서 화학적으로 안정한 부식 저항성 및 열충격 저항성, 기계적 강도의 특성을 갖는 캐스타블 내화물을 제공하고자 한 것이다.The present invention relates to a refractory composition used for forming a ceiling of a fluidized bed reduction furnace for reducing iron ore, and to provide a castable refractory having chemically stable corrosion resistance, thermal shock resistance, and mechanical strength in a reducing gas atmosphere. It is.

이를 위해 본 발명은 100중량%로서, 실리카(SiO2) 1.5∼2.5중량%, 산화철 (Fe2O3)0.05중량% 이하, 칼시아(CaO) 8∼11중량%이고, 나머지가 알루미나(Al2O3)로 조성됨을 특징으로 한다.To this end, the present invention is 100% by weight, silica (SiO 2 ) 1.5 to 2.5% by weight, iron oxide (Fe 2 O 3 ) 0.05% by weight or less, calcia (CaO) 8 to 11% by weight, the remainder is alumina (Al 2 O 3 ) is characterized in that the composition.

철광석, 유동층 환원로, 천정부, 내화 조성물, 캐스타블Iron Ore, Fluidized Bed Reduction Furnace, Ceiling, Fire Resistant Composition, Castable

Description

분철광석의 환원을 위한 유동층 환원로의 천정부 성형에 이용되는 내화 조성물{refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore}Refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore}

도 1은 일반적인 고로법에 따른 제선 공법을 설명하기 위한 개략도1 is a schematic view for explaining the steelmaking method according to the general blast furnace method

도 2는 본 발명이 적용되는 파이넥스 공정에 따른 제선 공법을 설명하기 위한 개략도Figure 2 is a schematic diagram for explaining the iron making method according to the Finex process to which the present invention is applied

도 3은 도 2의 구성요소인 유동층 환원로를 나타낸 확대도3 is an enlarged view showing a fluidized-bed reduction furnace which is a component of FIG.

1: 유동층 환원로 2: 분산판
3: 용해로 4: 천정부1: fluidized-bed reduction furnace 2: dispersion plate
3: melting furnace 4: ceiling

본 발명은 분철광석(粉鐵鑛石)을 유동화 반응에 의해 환원하기 위한 유동층 환원로(fluid layer reduction furnace)의 천정부(天井部) 성형에 이용되는 내화재에 관한 것으로, 보다 상세하게는 캐스타블 내화물(castable refractories)로써, 고강도, 내마모성, 환원성가스에 의한 내부식성, 내열충격 및 우수한 시공성을 갖게 하는데 적합한 파이넥스(FINEX)공정에 따른 유동층 환원로의 천정부 성형에 이용되는 내화 조성물에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material used for forming a ceiling part of a fluid layer reduction furnace for reducing iron ore by fluidization reaction, and more particularly, castable ore. As a refractory (castable refractories), the present invention relates to a refractory composition used for forming a ceiling of a fluidized-bed reduction furnace according to the FINEX process suitable for having high strength, abrasion resistance, corrosion resistance by reducing gas, thermal shock, and excellent workability.

근대의 제철법은 간접법이라 하여 일단 용선(鎔銑)을 만들어 이것을 탈탄하여 강을 만든다. 용선을 만드는 제선법으로서는 코크스를 연료로 하는 용광로법(고로법)이다.Modern steelmaking method is called indirect method, and it makes molten iron and decarburizes it to make steel. As an iron making method for making molten iron, a blast furnace method using coke as a fuel (blast furnace method) is used.

도 1은 일반적인 용광로법에 따른 제선 공법을 설명하기 위한 개략도로써, 철광석을 분쇄, 선광, 분광의 단광, 소결(燒結)하여 일정크기의 덩어리로서 용광로에 장입할 수 있는 견고한 펠렛을 만드는 전처리 과정을 거치게 되고, 유연탄을 이용하여 코크스를 만든 다음 이를 연료로 사용하고 있다. 상기 제조된 펠렛 및 코크스를 고로에 장입하여 불을 붙여 용선을 만들게 된다.1 is a schematic view for explaining the steelmaking process according to the general blast furnace method, a pretreatment process of crushing, beneficiation, spectroscopic briquettes, sintering to make a solid pellet that can be charged into the furnace as a certain size of lumps; Coke is made from bituminous coal and used as fuel. The prepared pellets and coke are charged to the blast furnace to make a molten iron by fire.

상기와 같은 고로법은 대량생산이라는 점에서 볼때 가장 우수한 방법으로 활용되고 있는 실정이나, 공정의 복잡성과 함께 소결광 및 코크스 제조를 위한 대규모 설비가 별도로 필요함에 따라 고 비용의 제조원가 등의 경제적 부담을 갖게되며, 또한 소결광제조 및 코크스제조 과정을 거침에 따라 환경오염 물질인 황산화물(SOX), 질소산화물(NOX), 이산화탄소(CO2)등이 배출되는 문제점이 발생하게 된다.The blast furnace method as described above is used as the best method in terms of mass production, but due to the complexity of the process, a large-scale facility for sinter ore and coke production is separately required to have an economic burden such as high production cost. In addition, as the sintered ore and coke are produced, problems such as sulfur oxides (SO X ), nitrogen oxides (NO X ), and carbon dioxide (CO 2 ) are emitted.

상기한 고로법에 따른 문제점을 갖는 생산방식을 변경하여 철광석의 전처리 과정 및 코크스 과정을 없애고 직접 천연상태의 분철광석을 유동화 반응에 의해 환원시킬 수 있는 설비가 최근 국내 철강 제조 업체인 포스코(포항종합제철소)에서 처음 개발되어 특허출원(출원번호 : 10-1995-41931)된 후 특허(특허번호 : 10-236160)된 것으로, 이를 파이넥스(FINEX) 공정이라 자체 명명하고, 최근에 그 설비가 건설되어 시험 가동되고 있다.
첨부된 도 2는 본 발명의 적용되는 파이넥스 공정에 따른 제선 공법을 설명하기 위한 개략도이고, 도 3은 도 2의 구성요소인 유동층 환원로를 나타낸 확대도로써, 상기 파이넥스 공정은 분철광석을 여러단계의 유동층 환원로(1)에서 단계적으로 환원시켜 용해로(3)에 8∼50㎜의 성형탄과 함께 장입하여 용선을 만드는 것으로, 약 8mm의 분철광석이 여러단계로 나누어진 유동층 환원로(1)를 지나 환원된 철광석으로 변화되고, 이것을 성형하여 펠렛 형태(HCI;Hot Compact Iron)로 용해로(3)에 장입하여 원하는 쇳물을 경제적으로 생산하려는 새로운 제선 공법이다.By changing the production method which has the problem according to the blast furnace method, the facility which can eliminate the pretreatment process and the coke process of iron ore and directly reduce the iron ore in the natural state by the fluidization reaction has recently been developed by POSCO, a domestic steel manufacturer. First developed in steel mill and applied for a patent (Application No .: 10-1995-41931), and then a patent (Patent No .: 10-236160), which is called the FINEX process itself, and recently the facility was constructed It is running a test.
2 is a schematic view illustrating a method of forming a steel wire according to the Finex process applied to the present invention, and FIG. 3 is an enlarged view showing a fluidized-bed reduction furnace, which is a component of FIG. In the fluidized-bed reduction furnace (1) of step by step to charge into the melting furnace (3) with coal briquettes of 8 to 50mm to make molten iron. It is changed to reduced iron ore, and is molded into pellets (HCI; Hot Compact Iron) and charged into the melting furnace (3).

상기 유동층 환원로(1)는 상부인 천정부(4)가 폐쇄된 형태로써, 그 내부에는 지주대(도시는 생략됨)에 의해 분산판(2)이 지지되어 있는데, 상기 분산판은 고압, 고온의 환원성가스가 인입될 경우 이를 균일하게 분산시켜 분철광석이 유동화에 의해 환원되도록 하는 부재이며, 가스가 통과될 수 있게끔 복수개의 통공을 갖추고 있다.The fluidized-bed reduction furnace 1 is in the form of a closed ceiling (4) in the upper portion, the inside of the dispersion plate 2 is supported by a support (not shown), the dispersion plate is a high pressure, high temperature When the reducing gas is introduced, it is a member that uniformly disperses it so that the iron ore is reduced by fluidization, and has a plurality of holes to allow gas to pass therethrough.

상기 유동층 환원로(1)에서 천정부(4)의 성형은, 천정부 프레임(천정부를 이룰 기본 뼈대)에 내화재를 부착시킴에 따라 가능한데, 상기 내화재를 천정부 프레임에 부착할 때는 상기 내화재를 유동층 환원로(1) 내부로 직접 인입할 수 없음에 따라 상기 내화재를 거닝기(gunning machine)에 의해 스프레이 방식으로 시공을 하여야 하고, 상기 거닝기에 의해 시공된 내화재는 고압, 고온의 환원성가스 분위기 하에서도 안정되고, 급속한 승온 및 강온 조건하에서도 견딜 수 있어야 한다.Molding of the ceiling portion 4 in the fluidized-bed reduction furnace 1 is possible by attaching a refractory material to the ceiling frame (base skeleton to form a ceiling), and when attaching the refractory material to the ceiling frame, the refractory material is attached to the fluidized-bed reduction furnace ( 1) As the refractory material cannot be directly drawn into the interior, the refractory material should be sprayed by a gunning machine, and the refractory material constructed by the gunning machine is stable even under a high-pressure, high-temperature reducing gas atmosphere. It must be able to withstand rapid temperature and temperature drops.

따라서 상기 유동층 환원로(1)의 천정부(4)를 스프레이 방식에 의해 내화상태로 시공하는데 이용되는 내화재는 화학적 내구성, 특히 CO가스 부식저항성 및 열충격저항성은 물론 기계적 강도의 특성을 가진 재질이어야 한다.Therefore, the refractory material used to construct the ceiling portion 4 of the fluidized bed reduction furnace 1 in a refractory state by the spray method should be made of a material having chemical durability, particularly CO gas corrosion resistance and thermal shock resistance, as well as mechanical strength.

상기 천정부(4)의 시공에 이용되는 종래의 재질이라 함은, 기 설명된 바와 같이 파이넥스 공정 설비가 세계 최초로서 상업화 규모로 적용된 재질은 아직 없었으며, 다만 시험용 설비에 고 알루미나질 캐스타블(castable)이 사용된 바는 있으나, 사용 과정에서 CO가스 저항성과 내열충격성이 불량하여 사용 중에 수축 및 크랙이 발생되면서 탈락하는 문제점이 있었다.The conventional material used for the construction of the ceiling 4 is, as described above, there is no material applied to the commercialization scale as the world's first, but the high-alumina castable ( Although castable) has been used, there has been a problem in that the CO gas resistance and the thermal shock resistance in the use process is falling off due to shrinkage and cracking during use.

따라서 소규모 시험용이 아닌 대규모 상업 생산이 가능한 년산 100만톤 이상 규모의 반응로 설비로서, 주 사용온도인 600∼1000℃ 근방에서 환원성가스 및 철광석에 함유된 여러 성분과의 사용 중 화학적 반응이 없어야하고, 분철광석의 고온 및 고유속 유동화 조건에서 우수한 내마모 특성을 갖어야 하며, 연속조업(漣續操業)이 아닌 단속조업(斷續操業)시 균열이 주로 발생할 수 있으므로, 조업재개에 따른 급속한 승온, 강온에서도 견질수 있는 우수한 내열충격성이 요구된다.Therefore, it is a reactor facility with annual production capacity of more than 1 million tons, which can be used for large-scale commercial production, not for small-scale test, and there should be no chemical reaction during use with various components contained in reducing gas and iron ore near the main temperature of 600 ~ 1000 ℃. It should have excellent wear resistance at high temperature and high velocity fluidization conditions of iron ore, and cracks may occur mainly in intermittent operation rather than continuous operation, so it is possible to rapidly increase temperature Excellent thermal shock resistance that can withstand high temperatures is required.

또한 유동층 환원로(1)의 천정부(4)는 설계되는 구조적 특성상 외부에서 내화상태로 미리 완벽하게 성형한 다음 이를 설치할 수는 없는 것이므로, 상기 천정부(4)의 뼈대인 천정부 프레임에 내화재를 부착시켜 완벽하게 성형할 수 밖에 없고, 이에 따라 천정부 프레임에 부착될 내화재는 거닝기에 의한 스프레이 방식의 시공이 가능한 부정형 재질로서 시공성이 확보되어야 하며, 대형 시공체이므로 시공 후 양생 및 건조과정에서도 시공체의 변형이나 건조 중 폭발하는 문제점을 가지고 있으면 안된다.In addition, since the ceiling part 4 of the fluidized-bed reduction furnace 1 cannot be completely molded and installed in a fireproof state in advance from the outside due to its structural characteristics, it is possible to attach a fireproof material to a ceiling frame that is a skeleton of the ceiling part 4. In addition, the refractory material to be attached to the ceiling frame must be secured as an indefinite material that can be sprayed by a ganning machine and must be secured. It should not have a problem of explosion during drying.

따라서 시험용이 아닌 상업용 설비에서는 보다 더 가혹한 사용조건, 특히 급속 승온과 강온조업에 따른 열충격 조건이 예상되므로 천정부용 재질의 구비 특성으로써, 시공체 비중 2.55이하, 사용온도 조건에서의 건조 압축강도 750kg/cm2 이상, 기공율 30% 이상, ASTM C288 기준 A-B등급 이상의 CO가스 저항 특성을 갖는 제품 설계기준에 적합하여야 한다.Therefore, in non-test commercial facilities, harsher operating conditions, especially thermal shock conditions due to rapid temperature rises and low temperature operations, are expected. Therefore, the specific characteristics of the ceiling materials include a specific gravity of less than or equal to 2.55 and a dry compressive strength of 750 kg / It should meet the product design standard with CO gas resistance property of cm 2 or more, porosity more than 30% and ASTM C288 standard AB or better.

본 발명은 상기한 시험용 내화물과 다르게 조성하므로서 이를 이용하여 유동층 환원로의 천정부를 성형하고, 이후 유동층 환원로에 의해 입도 분포가 넓은 분철광석을 여러관계로 환원시킬때 환원가스의 분위기에서 화학적으로 안정한 부식 저항성 및 열충격 저항성, 기계적 강도의 특성을 갖는 천정부 성형용 캐스타블 내화물을 제공하고자 하는데 그 목적이 있다.The present invention is formed differently from the above-described test refractory material by using this to form a ceiling of the fluidized bed reduction furnace, and then chemically stable in the atmosphere of the reducing gas when reducing the iron ore having a wide particle size distribution in various relationships by the fluidized bed reduction furnace An object of the present invention is to provide a castable refractory for forming a ceiling part having characteristics of corrosion resistance, thermal shock resistance, and mechanical strength.

상기한 목적의 본 발명은, 100중량%로서, 실리카(SiO2) 1.5∼2.5중량%, 산화철(Fe2O3)0.05중량% 이하, 칼시아(CaO) 8∼11중량%이고, 나머지가 알루미나(Al2O3)로 조성됨을 특징으로 하는 분철광석의 환원을 위한 유동층 환원로의 천정부 성형에 이용되는 내화 조성물을 제공함에 의해 달성될 수 있다.The present invention for the above object is 100% by weight, silica (SiO 2 ) 1.5 to 2.5% by weight, iron oxide (Fe 2 O 3 ) 0.05% by weight or less, calcia (CaO) 8 to 11% by weight, the rest is It can be achieved by providing a refractory composition used for forming the ceiling of the fluidized-bed reduction furnace for the reduction of ferrous ore characterized in that it is composed of alumina (Al 2 O 3 ).

상기한 조성에서 실리카(SiO2)와 산화철(Fe2O3)의 조성범위를 한정한 것은, 시공특성과 CO가스 저항특성을 확보하기 위한 것으로, 실리카(SiO2)의 함량이 1.5중량% 이하에서는 스프레이건을 이용한 분사 시공성이 불량해지고, 2.5중량% 이상으로 되면 유리된 실리카의 성분으로 인해 고온, 고압에서의 CO가스 저항성이 저하되거나 고온에서의 소결 수축이 발생되어 내열충격성이 저하된다. 그리고 산화철(Fe2O3)은 CO가스 저항 특성을 위한 것으로, 0.05중량% 이하가 바람직하다.In the above composition, the composition range of silica (SiO 2 ) and iron oxide (Fe 2 O 3 ) is limited to ensure construction characteristics and CO gas resistance characteristics, and the content of silica (SiO 2 ) is 1.5 wt% or less. In the case of spraying property using a spray gun is poor, when the content of more than 2.5% by weight of the free silica component, the CO gas resistance at high temperature and high pressure is reduced, or the sintering shrinkage at high temperature is generated to reduce the thermal shock resistance. And iron oxide (Fe 2 O 3 ) is for the CO gas resistance characteristics, 0.05% by weight or less is preferred.

칼시아(CaO)는 재질 중에 포함된 CaO함량으로서, 예를 들면 알루미나시멘트의 사용을 들 수 있다. CaO의 함량이 8중량% 이하면(즉, 어떤 종류의 시멘트를 사용하건 또는 어떤 CaO를 포함한 원료를 사용하건) 시공성이 확보되지 않으며, 거닝 시공시 부착율이 저하되어 리바운드로스가 증가하게 되며, 요구되는 강도를 확보할 수 없다.Calcia (CaO) is CaO content contained in a material, For example, use of an alumina cement is mentioned. If the content of CaO is less than 8% by weight (i.e., using any kind of cement or raw material containing any CaO), the workability is not secured, the adhesion rate decreases during the ganning construction, and the rebound loss increases. The required strength cannot be secured.

또한 CaO함량이 11중량% 이상이 되면 시공성 및 강도확보는 가능하나, 상대적으로 주 성분인 알루미나(Al2O3)의 량이 감소되며 고온에서의 강도저하가 발생되므로 내열충격성이 저하된다.In addition, when the CaO content is 11% by weight or more, the workability and strength can be secured, but the amount of alumina (Al 2 O 3 ), which is a relatively main component, decreases and the strength decreases at a high temperature, thereby reducing the thermal shock resistance.

상기 주 성분인 알루미나(Al2O3)을 얻기 위해서는 소결알루미나 또는 용융알루미나를 사용할 수 있으며, 본 발명에 적용되는 유동층 환원로(1)는 사용조건이 강한 환원성 분위기이므로 주 성분인 알루미나는 95% 이상의 고 알루미나일 수록 바람직하다.Sintered alumina or fused alumina may be used to obtain alumina (Al 2 O 3 ), which is the main component, and the fluidized-bed reduction furnace (1) applied to the present invention has 95% of the alumina, which is a main component because the conditions for use are strong. The higher alumina mentioned above is more preferable.

본 발명은 전체 조성을 100중량%로 하여, 주 성분으로서 알루미나 성분이 너무 적으면 나머지 부 성분(주 성분을 제외한 나머지 성분)의 함량이 많아 상기에서 언급한 특성을 얻기 어려우며, 또한 CaO의 량이 증가하여 강도가 저하되므로 바람직하지 않으며, 반대로 주 성분으로서 알루미나 성분이 너무 많으면 상대적으로 나머지인 부 성분의 량이 감소하여 물성을 만족시키기 어려우며 그 중 비중이 증가하여 기공율이 30% 이하로 떨어지게 된다.In the present invention, the total composition is 100% by weight, and if the alumina component is too small as a main component, the content of the remaining subcomponents (other components except the main component) is high, making it difficult to obtain the above-mentioned characteristics, and the amount of CaO increases. It is not preferable because the strength is lowered. On the contrary, if the alumina component is too large as the main component, the amount of the remaining minor component is relatively decreased to satisfy the physical properties, and the specific gravity is increased, and the porosity falls below 30%.

상기와 같은 본 발명 조성은, 분철광석의 환원을 위한 유동층 환원로(1)의 천정부(4)를 성형하기 위한 재질로써, 시공체의 비중 2.55이하, 1000℃온도에서 기공율 30% 이상, 건조 압축강도 750㎏/㎠ 이상. 천정부 시공 리바운드로스 10% 이하, CO가스 저항성 ASTM C288기준 A∼B 이상의 특성을 갖는 알루미나질 내화 조성물이다.The composition of the present invention as described above is a material for forming the ceiling portion 4 of the fluidized bed reduction furnace 1 for the reduction of the iron ore, the specific gravity of the construction body is 2.55 or less, porosity 30% or more at 1000 ℃ temperature, dry compression 750 kg / cm 2 or more in strength. It is an alumina fire-resistant composition which has the property of 10% or less of ceiling rebound loss, and CO gas-resistance ASTM C288 standard A-B or more.

이하 파이넥스 공정에 따른 유동층 환원로의 천정부 성형에 이용되는 내화 조성물을 시험설비(비교예)와 상업설비(실시예)로 구분하여 비교하면 다음의 표와 같다.Hereinafter, the refractory composition used for forming the ceiling of the fluidized bed reduction furnace according to the FINEX process is divided into test equipment (comparative example) and commercial equipment (example).

(표 1)Table 1

비교예  Comparative example 실시예  Example 적용예      Application example 시험설비 Test facility 상업설비 Commercial facility 시공방법     Construction method 유입시공 Inflow construction 거닝시공 Gunning construction 화학성분 (%) Chemical composition (%) Al2O3 Al 2 O 3 93    93 87    87 SiO2 SiO 2 1     One 1.7    1.7 Fe2O3 Fe 2 O 3 0.01   0.01 0.01   0.01 CaOCaO 9.5    9.5 부피비중 kg/㎥Volume specific weight kg / ㎥ 2,900  2,900 2,520  2,520 기공율(%)1000℃Porosity (%) 1000 ℃ 31    31 압축강도 (kg/㎠)Compressive strength (kg / ㎠) 110℃110 ℃ 450   450 800   800 1000℃1000 ℃ 300   300 400   400 CO가스 저항성 ASTM C288CO Gas Resistance ASTM C288 A    A A     A 시공리바운드로스(%)Construction Rebound Loss (%) 10    10

한편 본 발명 내화 조성물을 유동층 환원로(1)의 천정부(4) 시공에 이용할 때 스프레이를 위해 사용되는 거닝기는 공기 토출압력 2㎏/㎠이상, 수분 토출압력 2㎏/㎠이상의 거닝기를 사용하였다.On the other hand, when using the refractory composition of this invention for the construction of the ceiling part 4 of the fluidized bed reduction furnace 1, the gunning machine used for spraying used the gunning machine of 2 kg / cm <2> or more of air discharge pressures, and 2 kg / cm <2> or more of water discharge pressures.

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이상에서와 같이 본 발명은 기본 설계상 요구되는 시공성 확보, 시공체의 부피 비중 2.55이하, 1000℃온도에서 기공율 30% 이상, 건조 압축강도 750kg/cm2 이상. 천정부 시공 리바운드로스 10% 이하, CO가스 저항성 ASTM C288기준 A∼B 이상의 특성을 갖는 알루미나질 내화재를 얻게되므로, 이를 이용해 유동층 환원로(1)의 천정부(4)를 시공하였을 때 양생 및 건조과정에서 시공체의 변형이나 건조 중 폭발하는 문제가 발생되지 않게되는 효과가 있다.As described above, the present invention ensures the workability required in the basic design, the bulk specific gravity of the construction body is 2.55 or less, porosity 30% or more at 1000 ℃ temperature, dry compressive strength 750kg / cm 2 or more. Since alumina refractory material having characteristics of ceiling rebound loss of 10% or less and CO gas resistance of ASTM C288 or higher is obtained, the curing and drying process is performed when the ceiling part (4) of the fluidized-bed reduction furnace (1) is used. There is an effect that the problem of deforming or deforming of the construction body does not occur.

Claims (1)

100중량%로서, 실리카(SiO2) 1.5∼2.5중량%, 산화철(Fe2O3)0.05중량% 이하, 칼시아(CaO) 8∼11중량%, 나머지가 알루미나(Al2O3)로 조성되는 내화 조성물을 함유하는 분철광석의 환원을 위한 유동층 환원로의 천정부.100 wt%, silica (SiO 2 ) 1.5-2.5 wt%, iron oxide (Fe 2 O 3 ) 0.05 wt% or less, calcia (CaO) 8-11 wt%, the remainder is composed of alumina (Al 2 O 3 ) A ceiling of a fluidized-bed reduction furnace for the reduction of iron ore containing the fire resistant composition.
KR20030059132A 2003-08-26 2003-08-26 refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore KR100558653B1 (en)

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PCT/KR2004/002098 WO2005019482A1 (en) 2003-08-26 2004-08-20 Refractory composition for constructing dome portion of fluidized bed reduction furnace for reduction of iron ore
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CN102757252A (en) * 2012-08-09 2012-10-31 山国强 1080 m<3> blast furnace main iron runner castable
CN102757252B (en) * 2012-08-09 2013-07-31 山国强 1080 m<3> blast furnace main iron runner castable

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CN101759437A (en) 2010-06-30
CN1839208A (en) 2006-09-27

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